economics: study of the production, consumption, and distribution
of commodities, defined in turn as those goods, services (including
labor and capital services) and relationships that are explicitly traded
for one another or for currency.

political economy: study of the social and political institutions
and conventions that underlie economic activity (e.g., the ownership of
property, labor, and capital), and how these institutions and conventions
determine the distribution of commodities among human societies.

geography: (1) the distribution of physical, social, and
human-built components across the earth’s surface; (2) the
study of these distributions, their determinants, and their relationships.

“Economic geography is concerned with the spatial organization
and distribution of economic activity, the use of the world’s resources,
and the distribution and expansion of the world economy” [Stutz and de
Souza 1998: 41].